Harmony Acid Stain

Harmony Acid Stain is a range of concentrated acid colorants for concrete, which react with the concrete by in-depth penetration to produce rich and vibrant colours which are reminiscent of natural mineral shades.

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50.7€ tax incl.

In stock Order shipped within 1 to 3 days
  • 01 L
  • 05 L
  • 4 x 5L
  • 250 ml
  • 500 ml
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Harmony Acid Stain is a range of concentrated acid colorants for concrete, which react with the concrete by in- depth penetration to produce rich and vibrant colours which are reminiscent of natural mineral shades.

This product remains stable over time, providing many years of resistance to sunlight, and can be applied to any clean and dry Portland cement base surface (concrete, screed, levelling compound, etc.).


Type: Acid-based concrete colorants

Colours: 6

Odeur: sharp

pH: 0.5-1

Packaging: 1 l, 5 l, 20 l

Dosage: 1 litre = 8 / 10 m2 undiluted and subject to surface porosity.

Storage: 12 months in unopened original packaging, stored in a dry and frost-free location.

Guarantee: Manufacturer’s liability

Tools & Cleaning

Viton seal sprayer, mask, gloves and goggles, tarpaulin, long-handled scrubbing brush.

Clean tools in water after use.

Prepare the support

Concretes and screeds must be at least 14 days old.

Before starting, make sure that no protective agents such as varnishes or hardeners prevent the ingress of water. To find out apply a small amount of water on to the surface. If absorbed quickly, the surface is porous and can be stained with dye acid; when the water bubbles, the surface is not porous and something prevents water from entering.

At this stage of the process it is important to know what kind of product has been used. If the surface is protected by acrylic or concrete wax, we recommend the use of our paint remover or cleaning agent.

Prepare the surface using Harmony Preparatory agent.

Application Harmony Preparatory agent

Application must be completed within a temperature range of 10 ° - 25 °.

Dosage: 1 l / 10 m2.

1. Use Harmony Preparatory agent undiluted.

2. It is essential that a protective mask and gloves should be worn during application.

3. The acid colorant cannot be walked on after application, unless studded boots are worn.

It is recommended that protective overshoes should be worn, in order to avoid leaving any tread marks.

4. Allow the product to work for a few minutes, then rinse with a pH neutral cleaner or Harmony Neutral Cleaner.

5. Allow to dry for at least 24 hours or more, depending on the weather conditions, before applying Acid Stain.

Application of Acid Stain

After preparing the surface using Harmony Preparatory agent, protect all surfaces which are not to be coloured using a tarpaulin.

1st coat

Hold the PermaPro sprayer 30-60 cm above the concrete surface to be coloured. Lightly spray 1m2 of surface area with Harmony Acid Stain, using a Viton seal sprayer, then brush the surface using a long-handled broom or nylon brush to ensure that the acid penetrates the surface. Allow to dry for 2 - 4 hours. There is no need to rinse the concrete floor after the application of the first coat before applying the second coat. However, you may wish to rinse a small concealed section, in order to check that you are satisfied with the colour.

2nd coat

Once dry, spray the surface a second time, avoiding the formation of pools. Apply in the same way as the 1st coat BUT in the opposite direction. If you have worked from north to south, you will need to work from east to west for the 2nd application. Bubbles may appear during application, indicating that the acid is reacting. Wait for 2 - 4 hours after the 2nd application before commencing the neutralization process.


When Acid Stain is completely dry, remove all residue with a mop.

Then spray the surface with the Harmony Neutralizer.

Brush the surface with a broom and let the neutralizer work for 5 minutes.

Then rinse thoroughly with clear water.

If necessary, repeat the process several times until the desired result is achieved.


Let it dry for 72 hours.

Apply a varnish to enhance the colours and effects. Use our Wet-Varnish or SL Permapro.

For more information see data sheet Harmony Varnish.

Type of roomPath-path to, Terrace, Tower pool
Capacity1 L
Consumption1L to 10m2
Conservation12 months in its unopened packaging and stored in a dry, frost-free place
WarrantyRC manufacturer


We guarantee a secure payment by



  • Shipped within 48 hours After reception of payment. . Period for carriage between 2 and 4 days
  • Delivery to the following countries
    France, Belgium, Luxembourg, Germany, Austria, Poland.
  • For Corsica, the DOM/TOM and other destinations in Europe, please contact us so that we can assess the shipping costs

Customer Service

You can contact us

  • via chat : at the bottom right
  • via telephone : 04 42 20 10 09
    from Monday to Friday from 8:00 a.m. to 8:00 p.m. and Saturday from 8:00 a.m. to 6:00 p.m.
  • via email : At the following address contact@harmony-beton.com

Our services dedicated to professionals

  • Harmony Béton assists professionals with every construction / renovation project involving decorative concrete.
  • You will be guided in your product choice then in its utilisation
  • You can also follow our tutorial videos .
  • We offer wholesale purchase on pallets and can ship our products in white label or with the label of your company.
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  • For further information on the nature of the review controls, as well as the possibility of contacting the author of the review please consult our CGU.
  • No inducements have been provided for these reviews
  • Reviews are published and kept for a period of five years
  • Reviews can not be modified: If a customer wishes to modify their review then they can do so by contacting Verified Reviews directly to remove the existing review and publish an amended one
  • The reasons for deletion of reviews are available here.

4.6 /5

Based on 8 customer reviews

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Anonymous customer published the 30/05/2020 following an order made on 22/05/2020


Belle coloration mais attention la couleur finale dépend du support

Anonymous customer published the 30/04/2020 following an order made on 17/04/2020


Produit efficace. La combinaison de trois teintes s'est toutefois avérée plus surprenante que prévu. En particulier la couleur "châtaigne" a un rendu verdâtre différent de ce qui apparait sur le nuancier.

Anonymous customer published the 31/05/2018 following an order made on 15/05/2018


All perfect. Thank you.

Anonymous customer published the 04/04/2018 following an order made on 28/03/2018


sympa pour colorer les vieux bétons ternes. dommage qu'il n'existe pas plus de couleurs

Anonymous customer published the 30/10/2017 following an order made on 24/10/2017


génial pour colorer ma rosace.par contre obligé de prendre un vernis car sinon la couleur est terne

Anonymous customer published the 06/09/2017 following an order made on 07/08/2017


Super Top

Anonymous customer published the 27/09/2016 following an order made on 21/09/2016



Anonymous customer published the 07/08/2016 following an order made on 25/07/2016


Super produit que l'acide stain, colore le béton et résiste avec le temps.

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